$154 Cheap American Airlines flights from Washington to Seattle (IAD to SEA)

Make sure you go to our Covid-19 Travel Advisor to find out if there are any current quarantine requirements or travel advice reports in effect in SEA when flying in from Washington Dulles Intl. Airport (IAD).

Check your boarding pass to find out which Dulles Intl. Airport terminal you’ll be departing from on your way to SEA with American Airlines. If you can’t locate the information on there, contact your airline.

As you can’t travel nonstop from Washington Dulles Intl. Airport (IAD) to SEA with American Airlines, make the most of your layover. Treat yourself to a couple of refreshments at a welcoming airport bar, or wander around the terminal and indulge in some retail therapy.

As it’ll take around 8 hours and 7 minutes for your American Airlines flight to journey from IAD to Sea-Tac Airport, consider tossing a couple of travel games in your cabin bag. You never know — the passenger sitting next to you might love the chance to play to break up the trip.

If you’d like to book a journey from IAD to SEA, you can pick from 2 American Airlines flights daily.

For more info about changing your flight to SEA, please visit our Customer Service Portal.

This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.

Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.

Trying to figure out how early you should book your flight? It’s possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.